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Aussie (& S-Hemisphere) Cyclone Action 2012-2013


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The Euro has generally trended less interesting with everything this evening:

  • The Kimberley/Pilbara system has disappeared for the last couple of runs.
  • The Coral Sea low goes poof! by Day 10-- just seems to die in its cradle.
  • The Madagascar system looks like a crappy slopgyre perched off the N tip of the island by Day 10.

Blah.

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The Euro now develops a small cyclone in the SPAC, S of the Solomon Islands, in the 5-7-day range-- but then kills it. Shear, etc., I guess.

The Madagascar situation is much more interesting. The Euro has been insistent on a storm threatening the island late in the period, and this feature has steadily become better-defined with each run over the last couple of days. The latest (00Z) run now shows a very strong cyclone approaching Madagascar and then recurving poleward just offshore in the 9-10-day range. They definitely need to keep an eye on this:

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TC 05P located near 12.5S 159.9E with winds of 55kt (JTWC)

TC 06S located near 17.0S 110.6E with winds of 40 kt.

Steve

Thanks, Steve, for staying on top of things while I was traveling. :)

Here are both cyclones in relation to Oz. Freda should strengthen into a decent hurricane as it moves S-- however, the JTWC has it weakening to a TS as it bends SE toward New Caledonia. Both the JTWC and BoM keep Mitchell weak and offshore of Western Australia:

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Well, poleward of 20 degrees latitude the waters off western Australia are sort of EPAC-ish in terms of SSTs.

Stve

Yeah, I've noticed that-- that strong tropical cyclones around Oz are really pretty-much confined to the tropics-- unlike the NATL, where we can have spectacular, intense cyclones outside the tropics (Andrew, Charley, etc.).

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Ok, here's the Down Under Roundup:

  • Mitchell went poof!
  • Freda is probably peaking right now and should start to slowly unravel as it meanders S and SE, in the general direction of New Caledonia. In the long range (8-10 days), the Euro is showing Freda as a large, loose, remnant low hovering off the C Queensland coast.
  • Of interest to me are the longer-term signals in the S Indian Ocean off Africa. A cyclone is currently forming, and the Euro makes it quite strong while recurving it poleward and bringing it directly over La Reunion around Day 4. But after that, the Euro shows another cyclone-- this time a severe microcane-- approaching the upper end of Madagascar in the 8-10-day period. Kinda interestin'.

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By the way, just a little background Re: those two big islands E of Madagascar:

La Réunion is part of France. The population is ~840K and the capital is Saint-Denis. Maurice (English: Mauritius) is an independent island nation that enjoys the distinction of being the only African country rated a "full democracy" by the Democracy Index. The population is ~1.3 million and the capital is Port Louis. Both islands are resort destinations and look quite lovely.

The last hurricane-strength cyclone to directly impact La Reunion was Clotilda 1987, a Cat 1 that drifted very slowly across the island. Mauritius had a much more serious impact from Hollanda 1994, a borderline Cat 2/3 that rammed the main island (and capital city) head-on.

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The lastest JTWC package suggests Dumile has wandered a tad E, thus increasing the threat to La Reunion.  The latest forecast brings the center very close to the island with winds of 75 kt.

 

Interestingly, the Meteo France track does not reflect this E wobble, and they still take it well W of the island.

 

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In S-Hemisphere news today... Cyclone Dumile is brushing near La Reunion with winds of 65 kt-- however, the core is missing the island.  The Euro is showing an intense cyclone forming near Indonesia and heading S in the 7-10-day period.  The current  modeling suggests it'll miss Western Australia to the W-- but of course we'll need to keep an eye on this.  A lot can change in 10 days.

 

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So, Re: the Oz threat, the models diverge greatly:  the Euro keeps it weak and scuttles it WSW, keeping it well offshore of Western Australia.  The GFS shows a much stronger system threatening the Kimberley.  We'll just have to see.

 

Cyclone Dumile passed W of La Reunion yesterday, and it looks like the island was inside the gale radius and got some decent winds. And it looks like more fun is on the way for La Reunion and Maurice.  The last couple of runs have shown a cyclone raking the Mascarene Islands late in the period:

 

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The Euro has backed off from the Mascarene threat-- it now recurves a weaker cyclone well E of the islands.

 

In Oz, the model is back to showing a strong cyclone developing N of the Kimberley and shuttling WSW, moving parallel to-- and offshore of-- the Pilbara coast.

 

So nothing too exciting just yet.

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